Images: 1ST. LUCIA postmark on Great Britain QV 4d dull green (SG.192) stampdated C/JY 10 87 paying the correct UPU rate between UK and St. Lucia pmk'd on arrival from R.M.S.P. mailboat, or as loose mail on arrival from mail posted on board a British vessel.Exceptionally rare use and a probably unique display item.£500(STL14631)